Test tube heater



Feb. 18, 4936. H. A. WALKER ET AL TEST TUBE HEATER Filed March 7, 1955 2 Sheets-Sheet 1 Inventcms Harald F Sine/2rd H 14. l l a/lber Attorney Feb. 18, 1936. H. A. WALKER El AL 2,031,019

TEST TUBE HEATER Filed March 7, 19:55 2 Sheets- Sheet 2 Inventors fla/radd .7? E/rdnd 11 l l wlll'er v C By Attorney Patented Feb. 18, 1936 UNITED STATES PATENT 2,031,019 TEST TUBE HEATER Harry A. Walker, Somerville, and Harold P. Strand, Malden, Mass.

Application March 7, 1935, Serial No. 9,838

OFFICE 2 Claims. This invention appertains to new and useful is preferable be provided in this cord cord 20 extends and it that a suitable switch 2t 20.

The blocks l2 adjacent the ends are secured in place by the screws l3 which secure 10 In the drawings:

Figure 1 represents a front elevational View of the heater and cord attachment.

Figure 2 represents a front elevational view of the heater in adjusted position.

Figure 3 represents a sectional view taken substantially on line 33 of Figure 2.

Figure 4 represents a fragmentary vertical sectional view taken substantially on the line 4-4 of Figure 1.

Figure 5 represents an enlarged top plan view of the heater housing.

Figure 6 represents a sectional view taken subtom members snugly fit within the confines of the upper and lower portions of the shell ID as shown in Figure 4.

Obviously with the shell l having an open front, and the top and bottom members 24 25 being of horse-shoe shape as well as the top coverthe bottom 25,

test tube 21 supported in the socket 28 which 30 fi f 3 22353 3 g f fragmentm socket is suitably secured upon the base in a position underlying the heating assembly 9.

32: 2 gf ggggi taken substanuauy on To permit tilting operation of the heating assembly to positions such as 15 shown in Figure 2 35 ggfs g g gg gfi m i ga ri 2:; the shell M at its intermediate portion is provided this novel test'wbe heaterconsists of the base with a threaded shank 29 for disposition through 5 having the upstanding tubular standard 6 the bearing 8. An internally threaded knob 30 is engaged along the threaded shank 29 and can The heating assembly is generally referred to by numeral 45 the invention in specific terms, it is to be underpairs of openings it through which the resistance element I5 is trained. The ends of this resist- 55 ance element l5 are connected to the contact While the foregoing specification sets forth Having thus described our invention, what we claim as new is:

1. A test tube heater comprising a base, an upright on the base, a housing supported by the upright, said housing being of substantially horse-shoe shape defining a pocket, and a heating element extending throughout the interior of the said housing, and a pivotal connection between the said housing and the upright, said pivotal connection consisting of a bearing supported by the upright and having a smooth bore therethrough, a threaded shank on the housing for rotatable disposition through the bore, and a nut engageable on the said shank and against the bearing to retain the housing in pivotally adjusted position.

2. A test tube heater comprising a base, an upright, a heating unit having an opening therein through which a test tube can be inserted, a shank on the unit for general disposition through the upper portion of the upright and being provided with threads, a hand knob, said hand knob being provided with a threaded socket for receiving the said threaded portion of the shank and adapted to be tightened against the upper portion of the upright to fix the unit in any angularly adjusted position.

HARRY A. WALKER. HAROLD P. STRAND. 

